US6888626B2 - Device for automatically detecting characteristics of an ophthalmic lens and an automatic device for fitting a centering and drive peg incorporating it - Google Patents

Device for automatically detecting characteristics of an ophthalmic lens and an automatic device for fitting a centering and drive peg incorporating it Download PDF

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US6888626B2
US6888626B2 US10/161,679 US16167902A US6888626B2 US 6888626 B2 US6888626 B2 US 6888626B2 US 16167902 A US16167902 A US 16167902A US 6888626 B2 US6888626 B2 US 6888626B2
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lens
support
optical
mask
paths
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US20030015649A1 (en
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Xavier Levecq
Fabien Divo
Laurent Guillermin
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EssilorLuxottica SA
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Essilor International Compagnie Generale dOptique SA
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/02Testing optical properties
    • G01M11/0228Testing optical properties by measuring refractive power
    • G01M11/0235Testing optical properties by measuring refractive power by measuring multiple properties of lenses, automatic lens meters

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  • the invention relates to a device for automatically detecting various characteristics of an ophthalmic lens, in particular for recognizing the type of lens (constant power or progressive power, for example monofocal, multifocal or progressive lenses), measuring its power, its astigmatism, its prism, and possibly its power in different areas, and then identifying the note-worthy characteristics of the ophthalmic lens concerned, such as, for example, the positions of the optical center and the axis of the cylinder, in the case of a non-progressive lens, or the position of a characteristic point called the “prism reference point” or the axis called the “horizontal axis”, in the case of a progressive lens.
  • the invention also applies to fitting a centering and drive peg which is glued to the ophthalmic lens for positioning the lens correctly in a grinding machine for imparting to it the required contour, adapted to the shape of the chosen frame.
  • the invention finds a particularly advantageous application when the device is associated with a lens trimming machine designed to take up a lens after identification of its main characteristics and move it automatically to a grinding station where its contour is modified to adapt it to a chosen frame shape, taking also into account data specific to the user, such as the interpupillary distance and the height, as measured on the wearer.
  • Trimming an ophthalmic lens necessitates a knowledge of several characteristics specific to the lens. For example, to correct astigmatism effectively using a non-progressive lens, it is necessary to know the position of the optical center and the axis of the cylinder. Indeed, in the case of a non-progressive ophthalmic lens, the optical center must correspond, once the lens is fitted to the frame, to the position of the pupil of the eye. Any offset leads to a prism effect that increases as the power of the ophthalmic lens increases. To correct astigmatism effectively, the axis of the cylinder must also correspond to the axis of the prescribed cylinder.
  • a device called a lensometer is used to determine these two characteristics manually.
  • the operator moves the lens to locate the optical center and the axis of the cylinder at the same time, and a mechanical device marks the ophthalmic lens at three points that constitute reference points for positioning the lens.
  • the three reference points are then used to center the lens manually on a centering device.
  • the lens is then fitted with a centering and drive peg for locating it in the trimming machine.
  • the centering point of the progressive lens which is the point at which the pupil must be centered, is at a known distance from the PRP, and is therefore known if the PRP is known. Moreover, the horizontal axis gives the orientation with which the lens must be mounted on the frame for proper correction.
  • Progressive lenses always include two relief or diffusing etched markings. These are difficult to see, so lenses often have printed marks that are erased after fitting. These etched or printed markings are used to center the lens, as the lensometer cannot be used to center this type of lens.
  • the segment defined by the two etched markings defines the horizontal axis and the middle of the segment defines the PRP. If the lens is marked, the horizontal axis and the PRP are defined by the marks. A spot defines the PRP and two lines define the horizontal axis. If the lens is not marked, the operator applies marks on top of the etched markings, to make them more visible.
  • the invention provides a single device for determining the characteristics of an ophthalmic lens automatically, as well as its power, at one or more points on its surface.
  • the device advantageously also recognizes the type of lens (monofocal, multifocal, progressive, right-hand or left-hand). The operator can therefore be informed that the wrong lens has been chosen (a lens not corresponding to the prescription) before trimming it.
  • the optical characteristics are recognized automatically and without having to move the lens.
  • the invention provides a device for automatically detecting characteristics of an ophthalmic lens, including a support shaped to receive a lens and, on respective opposite sides of the support, on the one hand, an illumination system including an optical system for producing a light beam directed toward a lens on the support and, on the other hand, a system for analyzing the image transmitted by the lens on the support, wherein the optical system defines two alternate optical paths for the light beam and a mask forming a Hartmann matrix or the like is placed on one only of the paths at a location such that it occupies a predetermined position relative to an optical axis of the analysis system.
  • the device is also noteworthy in that the two optical paths have a common part on the upstream side of the support so that the lens is illuminated either by a complete parallel beam over the whole of its surface or by a beam of parallel individual light rays produced by the mask defining the Hartmann matrix.
  • a Hartmann matrix is a screen pierced with holes in a predetermined geometrical configuration, or a grid, or like means.
  • the illumination system includes at least two alternate light sources respectively corresponding to the two optical paths.
  • a first of the two light sources is a point source associated with a collimator lens adapted to generate a complete parallel beam illuminating the mask.
  • a second of the two light sources is adapted to illuminate the lens on the support via a portion of the optical system excluding the mask.
  • the second light source can be associated with a semireflecting mirror inserted between the mask and the support and materializing the intersection of the two optical paths.
  • the common portion upstream of the support is between the mirror and the support.
  • the mirror is between the mask and the support.
  • the second light source is a point source associated with a collimator lens adapted to generate a complete parallel beam directed toward the mirror, which directs the beam back toward the support with the ophthalmic lens on it. If the two parallel beams generated by the first and second light sources are mutually perpendicular, the mirror is typically at an angle of 45° to the optical axis of the beam from the first light source, which is also the optical axis of the analysis system.
  • the second light source is adapted to show up printed markings or etched markings in relief. In mineral lenses, however, the etched markings diffuse light. In this case, the second light source is replaced by a third light source at the periphery of the support to illuminate a lens on the support at grazing incidence.
  • the aforementioned analysis system includes a frosted translucent screen perpendicular to the optical axis between the support and an optical receiver.
  • the latter can be a matrix sensor associated with a suitable group of lenses, of the telecentric type, or a video camera whose lens takes the place of the group of lenses.
  • FIG. 1 is a theoretical diagram of a device in accordance with the invention.
  • FIG. 2 is a diagram showing how the point at which the lens is to be held is determined.
  • FIG. 3 is a theoretical diagram of a device for automatically fitting a centering and drive peg to the lens.
  • the device 104 for automatically detecting characteristics of an ophthalmic lens 102 includes a horizontal support 103 comprising a transparent glass plate with projections 106 forming a tripod for supporting the lens and, on either side of the support: on the one hand, an illumination system 108 including optics for producing a light beam directed toward a lens on the support and, on the other hand, a system 110 for analyzing the image transmitted by the lens on the support.
  • the optical system 111 is adapted to define two alternate optical paths 112 , 113 for the light beam.
  • the illumination system includes at least two alternate light sources S 1 , S 2 , respectively corresponding to the two optical paths previously cited.
  • the two optical paths 112 , 113 have a common portion 115 on the upstream side of the support, to be more specific between a semi-reflecting mirror 118 and the support 103 .
  • the mirror materializes the intersection of the two optical paths. It can be replaced by a splitter cube or a removable mirror.
  • a mask 120 forming a Hartmann matrix or the like is placed on one only of the paths (the path 112 in this example), at a location such that it occupies a predetermined position relative to an optical axis 125 of the analysis system 110 .
  • the optical axis 125 is in fact the common axis of certain lenses of the optical system that are centered relative to the source Si and of an optical receiver 128 forming part of the analysis system 110 on the other side of the support 103 .
  • the analysis system also includes a frosted translucent screen 129 perpendicular to the optical axis 125 between the support 103 and the optical receiver 128 .
  • the latter can be a matrix sensor or a video camera.
  • the frosted translucent screen 129 is a disc adapted to be driven in rotation by a motor 135 about an axis 136 parallel to the optical axis 125 and spaced therefrom, and is preferably a lens or the like with a frosted surface.
  • the first of these two sources is a point source associated with a collimator lens 139 adapted to generate a complete parallel beam illuminating the mask 120 .
  • the source S 1 is used to establish a kind of map of the lens (measured power/astigmatism at several points of the lens), to determine the optical center of non-progressive lenses, and to reposition the objects (etched markings, printed markings, segments) on the front face of the lens seen with S 2 .
  • S 1 can be mobile along the optical axis or an axis perpendicular thereto.
  • the collimator lens 139 is centered on the optical axis previously cited.
  • the optical system further includes an expander comprising two lenses 140 , 141 also centered on the optical axis previously cited and placed between the mirror and the support.
  • This expander generates a larger parallel light beam, which is larger than the ophthalmic lens, and images the mask 120 on the surface of the lens.
  • a second light source S 2 is adapted to illuminate the lens 102 on the support 103 via a portion of the optical system excluding the mask 120 forming the Hartmann matrix.
  • This second light source is associated with the semi-reflecting mirror 118 , which materializes the intersection of the two optical paths 111 , 112 .
  • This source S 2 is a point source associated with a collimator lens adapted to generate a complete parallel beam directed toward the mirror 118 .
  • the beam generated by S 2 is perpendicular to the beam generated by S 1 and the mirror is at an angle of 45° to the optical axis 125 so that the complete parallel beam from S 2 is reflected at this mirror and directed toward the support 103 of the ophthalmic lens.
  • the light emitted by the source S 2 is divided into parallel separate light rays at the exit of the expander 140 , 141 .
  • the source S 2 is mainly used to determine printed markings, etched markings in relief, and segments (bifocal and trifocal lenses).
  • a mineral ophthalmic lens includes diffusing etched markings.
  • the device includes a third light source, in this example a plurality of sources S 31 , S 3 n distributed circumferentially at the periphery of the support 103 , to illuminate a lens on the support at a grazing incidence.
  • the light rays must not be diffused by the frosting, and it is therefore necessary to provide either a retractable frosted lens or a lens having a polished area and used only in this situation.
  • the light sources S 1 , S 2 mentioned above can be light-emitting diodes (LED) or laser diodes, preferably associated with respective optical fibers.
  • the sources S 31 , S 3 n are preferably light-emitting diodes.
  • the source S 1 is used in conjunction with the mask forming a Hartmann matrix.
  • the complete parallel beam is converted by the mask 120 into a plurality of thin individual beams corresponding to the configuration of the mask. Each of these rays impinges on the entry face (front face) of the lens in a direction parallel to the optical axis. These rays are deflected by the lens and can be seen as light spots on the rotating frosted screen 129 .
  • the frosting is imaged on the matrix sensor associated with the telecentric device or that of the video camera, and the spots are analyzed by an electronic data processing system 16 ( FIG. 2 ) which determines their displacement.
  • the displacement of the spots of the mask i.e. of the light spots that can be seen on the frosted screen
  • the displacement of the spots of the mask is in linear progression from the center toward the periphery, compared to the positions of the same points when there is no ophthalmic lens on the support.
  • the positions of the points of the Hartmann mask on the screen when there is no lens on the support are measured during a calibration phase. Consequently, measuring a displacement of this kind determines the type of lens. For example, in the case of a convergent lens, the spots move toward the optical axis, by an amount increasing with the power of the lens.
  • the displacement of the spots varies along a line called the “progression line”.
  • the direction of the power gradient is determined by calculating the power at different points of the lens, for example using the method indicated below. This direction is the progression line. It is therefore possible to measure this and calculate from it the orientation of the progression line, which is one important characteristic of a progressive lens.
  • the ophthalmic lens 102 has been identified as a monofocal lens, it is a simple matter to determine the position of the optical center of the lens by comparing the light spots generated by the reference mask (which appear on the frosted screen 129 when there is no lens on the support) and the corresponding spots that can be seen on the frosted screen after deflection by the lens.
  • the light spot that has not been deflected corresponds to the position of the optical center.
  • this process relies on interpolation between the least deflected rays, for example using the least squares method.
  • the distance between the focus and the rear face of the lens represents the power.
  • the position of the rear face of the lens is given to a good approximation by the position of the support, since the lens is placed on it.
  • the image on the frosted screen of the mask forming the Hartmann matrix is used to determine the focus.
  • the position of the corresponding light spots is compared between the calibration image (without the lens) and the image obtained with the lens.
  • the position and direction of the light rays are compared for several adjacent points, to calculate the position of the focus on the optical axis (and thus the power, which is the reciprocal of the distance from the focus to the lens) and the astigmatism of the lens, if any (astigmatism axis and value).
  • the front face and the rear face can be considered to be at an angle, similar to a the surfaces of a prism.
  • the addition of a progressive lens is defined as the difference between the maximum power and the minimum power of the lens.
  • the prism reference point PRP is defined as the point at which the prism of the lens is equal to two thirds of the addition.
  • the prism reference point on a progressive lens is the center of a segment separating two etched marks on the lens. This point is usually also marked by a specific printed mark.
  • the PRP is identified by illuminating the lens with the light source S 2 , i.e. without using the Hartmann mask 120 .
  • the image transmitted by the ophthalmic lens appears on the frosted lens 129 , and is perceived by the optical receiver 128 .
  • the reading is accompanied by appropriate image processing to discern more clearly the etched or printed markings.
  • This visualization of the etched or printed markings and the determination of the PRP are then used to determine the centering point of the progressive lens, which is analogous to the optical center, and with which the position of the center of the pupil of the eye of the wearer must coincide, and the horizontal axis that defines the orientation of the lens in the frame.
  • the lens is generally circular, and the main object of this analysis is to determine its diameter.
  • the lens may already have a shape close to that of the frame for which it is intended Image processing determines the shape and dimensions of the non-circular lens, to verify that it is sufficiently large to fit into the frame.
  • the source S 2 is used to view the ophthalmic lens on the frosted screen.
  • Appropriate image processing shows the luminous intensity variations more clearly on the screen, so that a sharp contour of the limits of the segment can be obtained and its position accurately determined.
  • the source S 2 is used to view the printed or etched markings or the segment but does not determine their positions on the front face of the lens.
  • the source S 1 is used to calculate their precise position on the front face of the lens, once they have been acquired using the source S 2 .
  • the procedure is as follows. Consider a light spot A on the frosted screen 129 , corresponding to one of the holes in the Hartmann mask.
  • the corresponding light ray impinges on the front face of the lens 102 at A′.
  • the source S 2 is on, and the corresponding image that appears on the frosted screen is stored in memory.
  • the source Si is then turned on and the source S 2 turned off.
  • the image of the Hartmann mask therefore appears on the frosted screen 129 .
  • the height of each hole in the Hartmann mask i.e. the distance of the hole from the optical axis 125
  • the height of the ray corresponding to its point of entry on the front face of the ophthalmic lens 102 is known.
  • the height of the point A′ corresponding to the point A is known. Consequently, a correction can be applied to the point A to determine the point A′. It is therefore possible to find the position on the lens itself of any mark that can be read on the frosted screen, which increases the accuracy of the measurement.
  • using a Hartmann mask in conjunction with the light source S 1 improves all the measurements that are effected by illuminating the lens from a source S 2 along an optical path excluding the mask.
  • the measurements normally carried out using the source S 2 can be carried out under improved conditions by substituting for the source S 2 one or more sources illuminating the front face of the lens at grazing incidence.
  • FIGS. 2 and 3 a device for automatically applying a centering and drive peg to the ophthalmic lens, the peg defining a machining frame of reference necessary for trimming the edges of the lens to impart to it a shape corresponding to the chosen frame.
  • the optical sensor or the video camera 128 analyzes the image of the lens that is formed on the frosted screen 129 .
  • the information produced by the matrix sensor or the video camera is sent to a calculation and visualization system 16 .
  • the information is processed by an electronic data processing system 30 which also receives information representative of parameters specific to the morphology of the wearer, in particular the interpupillary distance and the height of the pupil relative to the horizontal axis.
  • the optician measures these parameters on the wearer and enters them into the system via a transmitter 32 .
  • Information representative of the contour of the chosen frame, which is stored in a memory 34 , for example, and selected by the optician, is also transmitted to the electronic data processing system 30 .
  • the electronic data processing system 30 produces a video image that is displayed on the screen 18 of a television monitor. Consequently, the contour of the frame and that of the untrimmed lens, with its particular characteristics, in particular the marker points it carries or that have been determined by using the device shown in FIG. 1 are seen on the screen, to the same scale. All these measured, calculated and read parameters are taken into account to determine the position of the perimeter of the trimmed lens relative to the original ophthalmic lens and, accordingly, the position of the point at which the lens is to be held for trimming, which is generally the center of the rectangle in which is inscribed the contour of a rim or “ring” of the frame.
  • the invention also relates to a device for automatically fitting a centering and drive peg to an ophthalmic lens, characterized in that it includes a detector device as previously described.
  • the device is therefore characterized in that it includes a controlled positioning mechanism 12 including a positioning arm 2 for positioning a centering peg 6 and adapted to engage in a space left free above the support 103 , to be more specific between the ophthalmic lens 102 and the lens 141 .
  • This mechanism is used to fix to the lens the centering and drive peg 6 that will act as a reference when the lens is installed in the trimming machine.
  • This peg must be placed at a precise point on the lens, which corresponds to the center of the rectangle in which is inscribed the contour of the rim or “ring” of the chosen frame. Because the lens is to be mounted with a predetermined orientation, the peg determines simultaneously the position of this point and the orientation of the lens to be trimmed relative to the grinding device.
  • the position and the orientation of the centering peg 6 on the lens are determined from the known optical center or centering point (in the case of progressive lenses), the astigmatism axis or the horizontal axis (in the case of progressive lenses), and parameters representative of the morphology of the wearer (interpupillary distance, height of the pupil relative to the frame, astigmatism axis of the wearer).
  • the optical center or centering point, the astigmatism axis and the horizontal axis are known as a result of using the measuring device described with reference to FIG. 1 .
  • the parameters representative of the wearer are entered via the device described with reference to FIG. 2 .
  • the positioning mechanism positions the peg correctly on the lens. Consequently, the mechanism has three degrees of freedom, two translation axes X and Y ( FIG. 3 ) for positioning the peg relative to the centering point, and a rotation axis (shaft 3 ) to conform to the correct orientation of the peg relative to the lens.
  • the peg 6 When the peg 6 has been positioned and oriented correctly, it is placed on the ophthalmic lens 102 by moving it along a supplementary translation axis Z.
  • the peg can include a pad 5 of adhesive material.
  • the axes X, Y and Z are orthogonal.
  • the device operates as follows:
  • the operator places a centering peg 6 on the shaft 3 carried by the arm 2 for positioning the peg.
  • the pad 5 of adhesive material is placed on the peg so that the latter adheres to the lens when the pad is moved into contact with the lens.
  • the characteristics of the ophthalmic lens 102 are determined as indicated above, in order to determine the lens characteristics necessary for centering it.
  • the centering peg has a reference indicator so that it can be positioned on the shaft 3 with a known orientation.
  • the arm 2 for positioning the peg is fastened to a mobile frame comprising a base 1 movable in a direction X by a motor M 1 and an intermediate block 4 movable in a direction Z by a motor M 3 .
  • the block 4 moves along a vertical portion of the base 1 .
  • the positioning arm 2 is moved along the block 4 in a direction Y by a motor M 2 .
  • the shaft 3 carried by the positioning arm 2 is driven in rotation by a motor M 4 carried by the arm 2 in order to be able to orient the peg 6 correctly relative to the ophthalmic lens 102 .
  • the positioning device is disengaged; in other words, the support 1 moving along the axis X is withdrawn as far as possible to avoid the positioning arm 2 interfering with the measuring device.
  • the plate 1 then moves toward the lens along the axis X and stops when the centering peg is at the correct position along the axis X.
  • the positioning arm 2 is then moved along the axis Y by motor M 2 , in accordance with the same principle, to position the peg correctly.
  • the shaft 3 rotates to orient the peg correctly relative to the lens.
  • the block 4 is moved along the axis Z by the motor M 3 , for example by means of a rack and pinion. This movement in translation positions the peg on the lens.
  • the peg is placed at the correct location on the lens.
  • the support 4 is then raised, but the peg 6 remains attached to the lens thanks to its adhesive pad 5 . All that remains is for the user to remove the lens from the support 103 and place it in the grinding device.
  • the system After disengaging the positioning mechanism, the system returns to the disengaged position, away from the optical path of the automatic detector device.

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  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Eyeglasses (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)
US10/161,679 2001-06-05 2002-06-05 Device for automatically detecting characteristics of an ophthalmic lens and an automatic device for fitting a centering and drive peg incorporating it Expired - Lifetime US6888626B2 (en)

Applications Claiming Priority (2)

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FR0107311 2001-06-05
FR0107311A FR2825466B1 (fr) 2001-06-05 2001-06-05 Dispositif de detection automatique de caracteristiques d'un verre ophtalmique et dispositif de positionnement automatique d'un pion de centrage et d'entrainement comprenant un tel dispositif de detection

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US20030015649A1 US20030015649A1 (en) 2003-01-23
US6888626B2 true US6888626B2 (en) 2005-05-03

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US (1) US6888626B2 (ja)
EP (1) EP1393036B1 (ja)
JP (1) JP3786941B2 (ja)
FR (1) FR2825466B1 (ja)
WO (1) WO2002099376A1 (ja)

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US20060192945A1 (en) * 2003-07-17 2006-08-31 Matthias Hornauer Device for visualizing a mark on a spectacle lense
US20090262992A1 (en) * 2008-04-18 2009-10-22 Markowitz H Toby Method And Apparatus For Mapping A Structure
US20140009737A1 (en) * 2012-07-06 2014-01-09 Viewitech Co., Ltd. Method for measuring parameters for manufacturing spectacle lens and device for realizing the same
US8823926B2 (en) 2011-11-25 2014-09-02 Carl Zeiss Vision International Gmbh Method and apparatus for visualizing a signature mark on a spectacle lens
WO2015128590A1 (fr) 2014-02-27 2015-09-03 Essilor International (Compagnie Générale d'Optique) Instrument optique pour repérer au moins un point caractéristique d'une lentille ophtalmique
WO2015128589A1 (fr) 2014-02-27 2015-09-03 Essilor International (Compagnie Générale d'Optique) Instrument optique pour identifier et localiser des microgravures présentes sur une lentille ophtalmique
US9802287B2 (en) 2012-03-02 2017-10-31 Essilor International (Compagnie Generale D'optique) System comprising a positioning and centering pin for an ophthalmic lens, an attachment member and a tool for positioning said attachment member on said positioning and centering pin

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FR2858408B1 (fr) * 2003-07-30 2005-11-11 Essilor Int Procede et machine de mesure de l'indice de refraction d'une lentille ophtalmique
DE10348509A1 (de) * 2003-10-18 2005-05-19 Carl Zeiss Jena Gmbh Wellenfrontsensor
FR2863719B1 (fr) * 2003-12-10 2006-04-07 Essilor Int Dispositif de detection automatique de reperes d'une lentille ophtalmique
EP1739472A4 (en) * 2004-03-31 2011-01-12 Topcon Corp MOUNTING APPARATUS
FR2878973B1 (fr) 2004-12-03 2007-04-20 Essilor Int Dispositif de mesure automatique de caracteristiques d'une lentille ophtalmique
FR2878970B1 (fr) 2004-12-03 2007-04-06 Essilor Int Dispositif de preparation automatique au montage de lentilles ophtalmiques permettant la prise en charge de plusieurs lentilles simultanement
FR2878979B1 (fr) * 2004-12-03 2007-04-20 Essilor Int Procede et dispositif de mesure de puissance d'une lentille ophtalmique par mesure optique globale sans contact et palpage combines
JP2009145081A (ja) * 2007-12-11 2009-07-02 Fujinon Corp 回転非対称収差の発生要因誤差量測定方法および装置
FR2939190B1 (fr) * 2008-12-02 2014-11-14 Essilor Int Dispositif et procede pour mesurer une caracteristique geometrique relative a la cambrure d'une lentille ophtalmique
EP2223650A1 (en) 2009-02-25 2010-09-01 The Provost, Fellows and Scholars of the College of the Holy and Undivided Trinity of Queen Elizabeth near Dublin Method and apparatus for imaging tissue topography
FR2984500B1 (fr) 2011-12-15 2014-01-10 Essilor Int Systeme et procede de lecture optique de marquages imprimes sur une face d'une lentille ophtalmique
WO2016141333A1 (en) * 2015-03-05 2016-09-09 Eyenetra, Inc. Methods and apparatus for small aperture lensometer
WO2017134275A1 (en) * 2016-02-05 2017-08-10 Eidgenossische Technische Hochschule Zurich Methods and systems for determining an optical axis and/or physical properties of a lens and use of the same in virtual imaging and head-mounted displays

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US9802287B2 (en) 2012-03-02 2017-10-31 Essilor International (Compagnie Generale D'optique) System comprising a positioning and centering pin for an ophthalmic lens, an attachment member and a tool for positioning said attachment member on said positioning and centering pin
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WO2015128589A1 (fr) 2014-02-27 2015-09-03 Essilor International (Compagnie Générale d'Optique) Instrument optique pour identifier et localiser des microgravures présentes sur une lentille ophtalmique
US20160363506A1 (en) * 2014-02-27 2016-12-15 Essilor International (Compagnie Générale d'Optique) Optical instrument for identifying and locating micro-etching on an ophthalmic lens
US20170016803A1 (en) * 2014-02-27 2017-01-19 Essilor International (Compagnie Générale d'Optique) Optical instrument for locating at least one characteristic point of an ophthalmic lens
WO2015128590A1 (fr) 2014-02-27 2015-09-03 Essilor International (Compagnie Générale d'Optique) Instrument optique pour repérer au moins un point caractéristique d'une lentille ophtalmique
US9885632B2 (en) * 2014-02-27 2018-02-06 Essilor International (Compagnie Generale D'optique Optical instrument for locating at least one characteristic point of an ophthalmic lens
US9885631B2 (en) * 2014-02-27 2018-02-06 Essilor International (Compagnie Generale D'optique) Optical instrument for identifying and locating micro-etching on an ophthalmic lens

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US20030015649A1 (en) 2003-01-23
JP2004530138A (ja) 2004-09-30
FR2825466B1 (fr) 2003-10-17
EP1393036A1 (fr) 2004-03-03
FR2825466A1 (fr) 2002-12-06
JP3786941B2 (ja) 2006-06-21
EP1393036B1 (fr) 2017-08-23

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